Ralph hart tweddell



(No Model.)

R. H. TWEDDELL, J. PLATT JQ FIELDING.

' HYDRAULIC RIVBTING MACHINE.

No.y 307,361. Patented oon. 28, 1884.

/NVENTRJ Unirse Sterns Arana* Varies.

RALPH HART TNVEDDELL, OF \VES'l`MlNSTER, COUNTY OF MIDDLESEX, AND JAMES PLATT AND JOHN FIELDING, OF GLOUCESTER, COUNTY OF GLOUCESTER, ENGLAND.

HYDRAULIC RIVETING-MACHINE.

SPECIFICATION forming part ox Letters Patent No. 307,361, dated October 28, 1884.

Application tiled April 19, i894. (No model.) latl med in England November l0, 1850, No. 4,609.

T0 all whom it may concer/1,

Be it known that we, RALPH HART TWED- DELL, of Westminster, in the county ot' Middlesex, and JAMEsPLA'rT and JOHN FIELD ING, ot Gloucester, in the 'county of Gloucester, and Kingdom of Great Britain, have invented certain new and useful Improvements in Hydraulic Machines for Riveting; and we do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

Our invention relates to improved directacting hydraulic machines for riveting and such like operations; and it consists iu the parts and combinations of parts, as will be more fully described, and pointed out in the claims.

In the accompanying drawings, Figure lis a view in vertical longitudinal section of. our improved device. Fig. 2 is a similar view of the hob or head which holds'up against the riveting-pressure, and Figs. 3 and 4 are deiuched views. l

A represents the base or frame ot' the niachine,1i rovided with the cylinder A, in which l the plunger B works. This plunger B carries the riveting-tool or heading-die a, rigidly se cured to the outer end thereof, and is provided with cylinder C,in which the annular plunger l) works. The cylinder C, in which the plungerl) works, communicates by a channel, b, with an annular space, Zr', around the main plunger B, which space is always in coinn'lunication with the supply ofworkingfluid. illhen, for the purpose ofriveting,the pressure is permitted to act on the hase ofthe plunger B, the plunger B advances and the pressingtool b ot'the plunger Il) takes a hearing `on one of the plates to be riveted, squeezing it firmly against the other plate,while the rivetingtool or heading-die a advances and upsets the rivet. On relieving the pressure on the base of the plunger B, the pressure, still acting on cylinder C, causes the drawback ot' the large plunger. The pressure on the base or rear end of the plunger B is greatly in excess of the pressure on the smaller area in the cylinder C, and hence, after the pressing-tool has been forced solidly against the plates to be riveted and is prevented from the plates together.

advancing any`farther, the plunger B still continues to advance and forces the water from the cylinder C. The riv'etingtool rests on one side of the plates or structure being operated on, and the holding-up tool on the other side. As soon as the rivet has been upset the pressure-water is allowed to escape from behind the plunger B. li' the closing-plunger is located in the larger plunger, B, as soon as the pressure against the inner i'ace of the plunger 6o is relieved, the water, acting against the rear .face ofthe plunger 1),(whieh is bearing against the plates being riveted,) forces the plunger B away from the plates being riveted. As there is no pressure behind B, the plungers B and D can be moved still farther inward and away from the plates being riveted by exerting a pressure on the outer end 'of either plunger. W'ater is then admitted to the rear ofplunger B, 4and the latter moves outward, carrying 7o with it the small closing-plunger D, which, together with theholding-up tool7 firmly clamp The riveting-tool again advances and upsets the rivet, and so on continuously. 7 lWhen it is desired to press the plates to be riveted from opposite sides, the hob or post may, as shown in Fig. 2, be in a like manner iitted with an annular plunger, B', carrying a pressing-tool, b, surrounding the holding-up 8o tool a', situated in the same .plane with the movable tool a.

Either of the devices shown in Figs. 2, 3, and 4 can be employed in connection with the machine shown in Fig. l. The` holding-up tool a of either ot` these devices rests in the same horizontal plane with the riveting-tool a, suiiicient space, however, being left between them for the free introduction of the plates to be riveted. In the device shown in Fig. 2 the 9o cylinder c is rigidly secured in position by one or more bolts, and the pressingtool rigidly secured to the head of said cylinder. This head is provided with a port, c', for the passage ot' the actuating-duid. The plunger B 95 is hollow and slides on the projection c2 of the head of the cylinder, and is provided at its outer end with the pressing-tool b. In cases l where it is inconvenient to allow space for the pressingplunger in the hob, as shown in Fig. roo

2, it may be arranged as shown by the dotted lines B3 on the back of the hob, and connected as shown in the part side elevation, Fig. 3, and plan, Fig. 4, by side rods and side levers, B", to two sliding bars, B5, one on each side of the holding-up tool a', the ends of these loars taking a bearing against one of the plates to be riveted and operated in the same manner as the pressing-tool b'.

lThe hob or post herein shown and described forms a part of the machine proper, and is shown detached for the want of space on the sheet of drawing.

Ve are aware that it is not broadly new to provide a closingplunger encircling or inclosing a riveting-plunger, and a hob or post, and hence we do not claim these devices, broadly; but,

Having fully described our invention, what we claim as new, and desire to secure by Letters Patent, is-

l. In a machine for riveting` the combination, with a cylinder and a plunger provided with a heading-die, of a hob or post provided with a stationary holding-up tool, and a movable tool for closing and pressing together the plates to be riveted.

2. In a riveting-machine, the combination, with a cylinder and a plunger provided with a heading-die, of a stationary holding-up tool and a pressing-tool surrounding said holdingl up tool and operated by hydraulic pressure.

3. The combination, with a cylinder and a plunger provided with a heading-die, of a hob or post provided with a holding-up tool, a small cylinder surrounding said tool,a plunger working in said last-named cylinder, and a pressing-tool secured to said plunger, substantially as set forth.

The combination, with a large cylinder, plunger, and heading-die secured to the latter, of an annular cylinder formed within the main plunger, a smaller plunger working in said cylinder, a pressing-tool secured to the small plunger, and a fixed holding-up tool situated in the same horizontal plane with the headingdie, substantially as set forth.

5. The combination, with a large cylinder, plunger, and headingdie, thc said plunger being provided with a small cylinder and ports, ot' a smaller plunger situated within said latter cylinder, and provided with a pressing-tool, and a hob or post provided with a holding-up tool, substantially as set TOrth.

G. The combination, with a large cylinder, a larger plunger provided with a heading-die, a small cylinder formed within the large plunger, ports connecting this small cylinder with the fluid supply, a small plunger working in the smaller cylinder, and a pressingtool secured to the small plunger, of a hob or post provided with a holding-up die, and a pressingtool, substantially as set forth.

Inv testimony whereof I have signed this specilcation in the presence of two subscribing witnesses.

RALPH HART TWEDDELL.

Vitnesses H. G. Sco'r'r, XVM. BAILEY.

In testimony whereof` we have signed this specication in the presence of two subscribing witnesses.

JAMES PLATT.

JOHN FIELDING.

fitnesses Y J oHN A. Porn, H. GADENNE. 

